The createUnsplittableCollection is a test command that will throw if run against any fle2 namespace (we do not support registering of those collection on the CSRS for now) . The suite unsplittable_collections_created_on_any_shard_jscore_passthrough attempts to turn any

into a "createUnsplittableCollection".

To prevent the command to run against fle2 namespace a check was introduced in SERVER-83399
but it should be placed also in the overridden getCollection